BBC Weather has warned there will be a “big drop” in temperatures on Friday night as a cold weather front moves in over the UK and unleashes torrential rain across the nation.

Britain is set to be battered with heavy rain over the weekend and the BBC has warned some parts of the country could also see some frost.

BBC Weather forecaster Chris Fawkes said: “The colder air is already with us across the northern half of the UK. But over the next 24 hours that colder air swings its way southwards across all of the UK. So, England and Wales turning much colder.”

The BBC forecaster compared temperatures over the weekend with the weather on Friday and said: “For some places, it is going to be 9C cooler. So, in Reading, for example, 21C today and just 12C tomorrow.”

The BBC host then warned of a “big drop in temperatures” as the country “turns colder”.

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MrFawkes warned there could be frost for some parts of the country. He said: “Between these two areas of bright weather, we have got a weather front. And, overnight, that front gets more active. Rain gets heavier for Wales and northern counties of England.

“To thesouth-eastofthiswe are in a mild area overnight. But, again, it is going to turn murky and some low cloud and some mist and fog patches and a bit of drizzle too. So the north of theUKit is cold.

“For Scotland, Northern Ireland and perhaps the far north of England as well there could be some pockets of frost in the countryside.”

The weekend will start with low pressure across England and Wales, which willbringwith it rainfall, while high pressure in the north will bring some sunshine.

BBC Weather: Frost in UK on Saturday night (Image: BBC)

The BBC forecaster warned as Saturday progresses the rain will get heavier across London and the south-east of England, with winds picking up.

He said: “It is going to be a cool day with temperatures between 10 and 14 degrees. But a big drop in temperatures across England and Wales will make it feel quite chilly here for the start of the weekend.”

The BBC forecaster said there is likely to be frost across the country on Saturday night.

There will be another “chilly” start to the day on Sunday. The BBC host added: “The rest of the weather will be across England and Wales with a lot of sunshine here.

“Further north and west we have got cloudier weather for Northern Ireland and Scotland with some rain. And the rain will turn quite heavy in western Scotland where it will also be windy.”

Met Office meteorologist Aidan McGivern warned there will be a U-turn on Friday night as “a deep area of low pressure” moves across Canada and triggers a drop in temperatures.

He said: “As that deepens it buckles the jet stream on the other side of the Atlantic – sending a ripple downstream and altering the position of the jet stream by the end of the week.”

The change in the jet stream will lead to more unsettled weather for much of the country on Saturday morning.

The Met Office forecaster warned heavier rainfall will start to move in on Saturday.

He added: “This time it is England and Wales that is likely to be prone to the most unsettled weather as we start off the weekend.

“A keen wind as well. And feeling cold under that wet weather. But it doesn’t quite reach the south-east and we could well draw up some warm air – so 19C possible."